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01.21.2008 at 11:20AM PST, ID: 23099040
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6.6

The maximum capacity (% of system) of a virtual server is limited to 50% of the virtual server host

Asked by realtimer in Microsoft Virtual Server 2005, Computer CPU Processors, Windows 2003 Server

Tags: ,

Within the resouce allocation of the Virtual Server CPU Resource Allocation, the Maximum Capacity (% of system) is capped at 50%, even when only 1 VS is running on the VSHost and that VM is set to 100% capacity. Microsoft suggests disabling hyperthreading when using VS, but when VS R2 SP1 was released, they stated that the issue with hyperthreading was addressed (when VM Additions are installed). From other posts online, I understand that the VS Host detects the difference between physical and logical processors, and the total system capacity is calculated as follows: # Physical CPU / # Logical CPU = Total Capacity.
So what I am then seeing is 1 CPU / 2 Logical CPU = 50% System Capacity.

We are wanting to invest in a beefer server to host additional VMs, but we want the reporting on resource allocations to be accurate.

If we setup a dual quad core system, is Virtual Server 2005 R2 SP1, going to show the maximum system capacity at 25%?

If disabling hyperthreading is the only method to get accurate reporting, will system performance be reduced?

Additional Information:
VS Host: Intel Core 2 Duo @ 2.6, 3GB RAM, Windows Server 2003 R2 Standard, 100GB 10K SCSI running Virtual Server 2005 Enterprise R2 SP1 (1.1.603.0 EE R2 SP1).

There are currently 2 virtual servers hosted on this system. Both are running WIndows 2003 R2 Standard with SP2 installed. VM Additions version 13.813 is installed on both vms.

Thanks,
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[+][-]01.21.2008 at 05:54PM PST, ID: 20711319

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About this solution

Zones: Microsoft Virtual Server 2005, Computer CPU Processors, Windows 2003 Server
Tags: Microsoft, Virtual Server 2005 R2 SP1
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Solution Provided By: brent_caskey
Participating Experts: 1
Solution Grade: A
 
 
[+][-]01.29.2008 at 12:28AM PST, ID: 20766160

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